.Principles and realizations of FBG wavelength tuning with elastic beams[J].Optoelectronics Letters,2005,1(1):5-9 Principles and realizations of FBG wavelength tuning with elastic beams ZHANG Wei-gang WU Zhi-gang LIU Yan-ge YANG Yi-fei KAI Gui-yun ZHAO Qi-da YUAN Shu-zhong DONG Xiao-yi LI En-bang XI Jiang-tao Joe Chicharo [1]Institute of Modern Optics, Nankai University, Tianjin 30071, China [2]School of Electrical, Computer and Telecommunication Engineering, Faculty of Informatics , University of Wollongong, NSW 2522, Australia Abstract:       The general principles and realizations of FBG wavelength tuning with elastic beams are proposed and demonstrated. Theories and experiments show that when displacement at the center point of simple beams,deflection of cantilever beams and torsion strain of torsion beams are relatively small,Bragg wavelength shifts of sensing FBGs have linear relationship with applied external stress, lateral displacement,torque and torsional angles,respectively. The experimental results indicate that the curvature sensitivity of the simple beam is 1.65 nm/m^-1 ,the displacement sensitivity of the equivalentstrain cantilever beam is 4.4 cm/kg and the torque and torsional angle sensitivities of the torsion beam are 6.27 nm/Nm and 0.086 7 nm/degree,respectively. Hits: 3532 Download times: 177 View Full Text    Download reader